Paper control for type-writing machines.



w. H. ANDERSON. PAPER CONTROL FUR TYPE WRITING MACHINES.

APPLICATION ElLED IAN. 3|, 1917- l,244,011. Patented 0 t.23,1917.

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ATTORNE V N; H. ANDERSON.-

PAPER CONTROL FOR TYPE WRITING MACHINES. APPLICATION FILED IAN. 31. I917- 1,244,01 1. Patented Oct. 23,191.

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ATTORNEY s'raus PATENT OFFICE.

NILS H. ANDERSON, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR OF ONE-HALF TO WILLIAM .A. LORENZ, 0F HARTFORD, CONNECTICUT. i

. PAPER CONTROL FOR TYPE-WRITING MACHINES.

To all whom it may concern Be it known that I, NILs H. ANDERSON, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented a new and useful Improvement in Paper Controls for Type-Writing Machines, of which the following is a specification.

This invention relates to the mechanism of typewriting machines which holds the paper to the platen. I

When a large number of copies are being made at one time or when the paper is comparatively thick and, stiff, or when envelops or cards are being put througha typewriting machine, the paper as it comes around the platen tends to stand up or assume a tangential position with relation to the surface of the cylindrical platen, and under such conditions when the type strike there Specification of Letters Patent.

is considerable noise and the impression is,

more or less imperfect.

The object of this invention is to provide means which can be readily attached to many of the present makes of typewriting machines and that is particularly serviceable for use in connection with single keyboard machines, that is, those machines in which the platen is raised and lowered for the different characters, which means will cause the paper being printed upon to follow around and closely hug the periphery of the platen and thus insure a firm backing with a consequent elimination of noise and an insurance of better impression of the type.

The invention is illustrated in connection with a typewriting machine of the Underwood make. Figure 1 shows a plan, with portions broken away, of such a typewriting machine provided with a paper holding means which embodies this invention. Fig. 2 shows on larger scalea section 'of the platen with paper passing about it and held down to its periphery by one form of holder which embodies this invention. Fig. 4 3 shows a front elevation of the machine, with parts broken away, so as to expose the paper holder. Fig. 4 shows a top view of a modifie'd form of holder. Fig. 5 shows a front elevation, and Fig. 6 shows an edge elevation of the same in the position occupied when holding paper to the surface of a platen.

In the class of machine illustrated the platen 1 is mounted on the paper carriage 2 in such manner-"that it is rotated when the carnage is returned after having been fed across the machine and is lifted when the v Patented Oct. 23, 1917.

' Application filed January 31, 1917. Serial No. 145,580.

shift keys 3 are depressed in order to change from one set of characters to the other by the well known mechanism. The platen is as usual also rotatable independently of the keys for turning in and setting the paper by the hand wheels 4:.

For causing the paper 5 to follow around the periphery and closely hug the platen, no matter how many thicknesses there are or how stiff the paper is, a curved spring finger 6 is provided. This spring finger conforms substantially to the surface of the platen and its upper end tends to bear down thereon quite a distance above as well as at about the horizontal diameter of the platen. This spring finger is formed at the upper end of Y shaped to bear against the platen at about its horizontal diameter. The lower ends of the yoke are fastened to rods 9 that extend forwardly and somewhat outwardly toward the sides and that have their front ends fastened to collars 10 which are fixed on a shaft 11. This shaft extends horizontally across the machine frame near the front and at each end is journaled in the upper end of a bracket 12 which isfastened to the top of the frame 13 near the front by a screw 14:. A spring 15 which is wound about the shaft near one end has one end engaged with a bracket 12 and has the other end engaged with one of the rods 9 in such manner as to tend to force down the holder so that the spring finger will bind the paper to the surface of the platen and yet will rise as the platen is lifted by the shift key. A latch 16 is pivoted to the shaft 11 near one end in such manner that when very heavy cards or envelops are put into the machine the holder may be locked against the platen by swinging the latch around into engagement with the front edge of the bracket 12 to which it is adjacent.

In the form of holder above described the lower ends of the yoke are fixedly attached to the inner ends of the supporting rods.- If it is desired the yoke may be pivotally connected with the supporting rods as illustrated in Figs. 4, 5 and 6. In this form the lower ends of the yoke 17 may be loosely mounted on studs 18 which pass through holes in the ends of the supporting rods 19. In this case it is desirable to wind springs 20 about the studs and have one end of each spring engaged with the end of the yoke,

and the other end of each spring engaged with the supporting rod, in such manner as to bend to throw the yoke with its vertical pressure finger 21 and horizontal pressure fingers 22 against the surface of the platen or such sheets of paper as are passed around the platen.

This device'holds the paper regardless of the number of sheets or the stifiness of the paper close to the surface of the platen whether the platen is in its lowest or highest position, without interfering with the free up and down movements of the platen, and it holds the sheetsbeing written on around the surface of the platen so that they have a solid backing, which insures good impressions and a minimum amount of noise. The yoke which supports the holding fingers straddles the ribbon carrier and the type" guide and does not interfere with the strik ing of the type against the paper at the desired spot. The yoke supporting rods extend forward and sidewise so as not to interfere with the movements of the type levers, and the brackets which support the shaft that carries the Wires are attached to the frame at the front where the attaching means can be easily manipulated. The resistance or pressure of the holder can be increased by locking it down when desirable.

The invention claimed is;

1. The combination with the frame and platen of a typewriting machine, of brackets attached to the frame, a shaft journaled in said brackets, rods extending from-said shaft, a yoke attached to said rods, a finger projecting from the yoke, and a spring on said shaft and arranged to cause the finger to bear upon the platen.

2. The combination with the frame and platen of a typewriting machine, of brackets attached to the frame near the front, a shaft journaled in said brackets, rods extending rearwardly from said shaft, a yoke attached to said rods, a finger projecting from the yoke, and a spring on said shaft and arranged to cause the finger to bear down upon the platen.

3. The combination with the frame and ets attached to the frame, a shaft journaled v in said brackets, rods extending from said shaft, a yoke attached to said rods, a finger projecting from the yoke, a spring on sa d shaft and arranged to cause the finger to bear down upon the 'platen, and a latch on the shaft and arranged to engage one of the brackets for locking the finger down upon the platen.

5. The combination with the frame and platen of a typewriting machine, of brackets removably attached to the frame near the front, a shaft journaled in said brackets, rods extending rearwardly from said shaft, a spring on said shaft and arranged to force the rods downwardly, a yoke pivotally attached to said rods, springs at the pivotal connections of the rods and yoke and arranged to force the yoke rearwardly, and fingers projecting from the yoke.

6. The combination with the frame and platen of a typewriting machine, of brackets removably attached to the frame near the front, a shaft journaled in said brackets, rods extending rearwardly from said shaft, a spring on said shaft and arranged to force the rods downwardly, a yoke pivotally attached to said rods, springs at the pivotal connections of the rods and yoke and arranged to force the yoke rearwardly, fingers projecting from the yoke, and a latch on the shaft and arranged to engage one of the brackets for locking the fingers down upon the platen.

7. The combination with the frame and platen of a typewriting machine, of bracketsiattached to the frame, a shaft journaled in said brackets, rods extending from said shaft, a yoke attached to said rods, a finger projecting from the yoke, and a spring arranged to cause the finger to bear down upon the platen.

NTLS H. ANDERSON. 

